21922537 has 32 divisors (see below), whose sum is σ = 29417472. Its totient is φ = 15842304.

The previous prime is 21922531. The next prime is 21922559. The reversal of 21922537 is 73522912.

It is a cyclic number.

It is not a de Polignac number, because 21922537 - 2³ = 21922529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21922499 and 21922508.

It is not an unprimeable number, because it can be changed into a prime (21922531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57048 + ... + 57430.

It is an arithmetic number, because the mean of its divisors is an integer number (919296).

Almost surely, 2^21922537 is an apocalyptic number.

It is an amenable number.

21922537 is a deficient number, since it is larger than the sum of its proper divisors (7494935).

21922537 is a wasteful number, since it uses less digits than its factorization.

21922537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457.

The product of its digits is 7560, while the sum is 31.

The square root of 21922537 is about 4682.1508946210. The cubic root of 21922537 is about 279.8746760580.

The spelling of 21922537 in words is "twenty-one million, nine hundred twenty-two thousand, five hundred thirty-seven".